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Try this with a constellation line,  and you'll see that it is a much
more intuitive method.  The only problem with it is that the overlay
you want to change will sometimes not appear on screen (perhaps because
it is turned off,  for example.)

   "Edit Overlay" will provide a list of overlays,  plus a "(Create
new overlay)" option.  If you select this 'create' option, Guide
will ask you to supply the new overlay with a name.  (Certain overlays,
including constellation lines and boundaries,  can't be edited.  They
are therefore omitted from the list.)

   When you tell Guide that you want to edit an overlay,  a small
floating dialog box appears.  Its main feature is a set of four radio
buttons:  "Normal Mode",  "Add Lines",  "Add Text",  and "Add Circles".
Each causes the mouse to assume a different function.

   In the "Normal Mode",  the mouse behaves normally:  right-clicking
selects objects in the chart,  and left-clicking pans.

   In "Add Lines" mode,  the mouse behaves normally,  except that
clicking and dragging the mouse with the right button causes Guide to
add that line to the overlay.  You can then add another line segment
with another right-click,  and so on,  to build up a polygon.

   When in  "Add Lines" mode,  you can still click on objects to get
information about them.  But instead of just right-clicking on them,
you have to hold the Shift key and right-click on them.  (This can be
useful if you decide you want to delete a line or two from the overlay:
you can Shift-right click on that segment,  then on "Delete",  and then
pick up from where you left off.)

   In "Add Circles" mode,  the mouse behaves normally,  except that
clicking and dragging the mouse with the right button causes Guide to
add a circle to the overlay.  The size of the circle depends on how
far you drag the mouse.

   In "Add Text" mode,  the mouse behaves normally,  except that
if you right-click on the chart,  Guide will prompt you for the text
to be added at that point.

   The floating dialog box also has a color selection box.  The color
you select here is applied to anything you add to the overlay.  Also,
you can eliminate an overlay entirely with the "Delete Overlay" option.

10:  USER OBJECT MENU                          

   In the User Object menu you can keep a list of the objects you're
interested in that don't appear in the "Go To Object" set of menus.
It is in the Overlays menu (hotkey F5).

   The first time you enter it looks like this:

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